One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,7,4,6)(9,10)(11,14)(12,15)(13,16)(17,21)(18,22)(19,23)(20,24)(25,26,32,36)(27,39,43,52)(28,44,46,50)(29,35,45,53)(30,38,31,37)(33,42,51,41)(34,40,54,47)(48,56,49,55)(1,3,5,4)(2,6,8,7)(9,11)(10,14)(12,19)(13,17)(15,23)(16,21)(18,20)(22,24)(25,27,30,41,32,43,31,42)(26,33,37,39,36,51,38,52)(28,45,40,49,46,29,47,48)(34,53,50,56,54,35,44,55)(1,3,5,4)(2,7,8,6)(11,17)(14,21)(18,19)(22,23)(25,28,30,40,32,46,31,47)(26,34,37,50,36,54,38,44)(27,29,41,48,43,45,42,49)(33,35,39,55,51,53,52,56)(9,12,13,20)(10,15,16,24)(11,18,17,19)(14,22,21,23)(25,29)(26,35)(27,40)(28,42)(30,48)(31,49)(32,45)(33,50)(34,52)(36,53)(37,55)(38,56)(39,54)(41,46)(43,47)(44,51)(1,4,5,3)(2,6,8,7)(10,16)(14,21)(15,24)(22,23)(26,36)(28,46)(29,45)(33,51)(37,38)(39,52)(40,47)(48,49)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.